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What makes diff. in pitch in a water xylophone? What is the relationship between pitch and frequency?

A xylophone is an idiophone, a type of percussion instrument that produces sound by vibration of the entire body of the instrument. Triangles and cymbals are other examples of idiophones. The xylophone belongs to the subgroup of idiophones that are played with mallets. Also in this family are the vibraphone, the glockenspiel, the marimba, the chimes or tubular bells, antique cymbals or crotales, and steel drums. The sound of the xylophone is sharp and brittle, with very little sustain.

Pitch is that characteristic of sound by which an acute or shrill note can be distinguished from a flat or grave note.
The frequency of note produced by a string in stringed instruments can be changed by changing the place of plucking or by using the string of less or more thickness.
Pitch of sound depends on (i) frequency
(ii) relative motion between source and listener.Pitch is a sensation only.


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